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Operating Segments (Schedule of Segment Reporting Information, by Segment, Virginia Power) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]        
Operating Revenue $ 3,941 $ 3,810 $ 11,059 $ 10,859
Net Income (Loss) 954 157 2,200 1,721
Virginia Electric and Power Company        
Segment Reporting Information [Line Items]        
Operating Revenue [1] 2,762 2,645 7,788 7,281
Net Income (Loss) 654 475 1,598 1,164
Dominion Energy Virginia | Virginia Electric and Power Company        
Segment Reporting Information [Line Items]        
Operating Revenue 2,762 2,645 7,788 7,281
Net Income (Loss) 662 535 1,571 1,315
Corporate and Other | Virginia Electric and Power Company        
Segment Reporting Information [Line Items]        
Operating Revenue 0 0 0 0
Net Income (Loss) $ (8) $ (60) $ 27 $ (151)
[1] See Note 19 for amounts attributable to affiliates.